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Definition of Pyrochlore
1. n. A niobate of calcium, cerium, and other bases, occurring usually in octahedrons of a yellowish or brownish color and resinous luster; -- so called from its becoming grass-green on being subjected to heat under the blowpipe.
Definition of Pyrochlore
1. Noun. (mineral) A mineral whose composition is that of a mixed niobate mostly of sodium, calcium and cerium, (Na,Ca)2Nb2O6(OH,F). ¹
¹ Source: wiktionary.com